missing empty diagnostics when toggling gc details off

go.mod and main.go

-- go.mod --
module mod.com

go 1.12
-- main.go --
package main

func main() {
	fn()
}

func fn() {}

missing_diags.log

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[Trace - 09:33:16.195 AM] Received request 'workspace/configuration - (2)'.
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[Trace - 09:33:17.160 AM] Sending request 'textDocument/codeLens - (4)'.
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[Trace - 09:33:17.162 AM] Received response 'textDocument/codeLens - (4)' in 1ms.
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working.log

[Trace - 09:21:59.693 AM] Sending request 'initialize - (1)'.
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[Trace - 09:21:59.699 AM] Received request 'workspace/configuration - (2)'.
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Params: {"type":3,"message":"2021/03/05 09:21:59 86.857813ms for GOROOT=/go GOPATH=/artefacts/govim/cmd/govim/scenario_default/script-codelens_gc_details/.home/gopath GO111MODULE=auto GOPROXY=http://127.0.0.1:45693/mod PWD=/artefacts/govim/cmd/govim/scenario_default/script-codelens_gc_details go list -mod=mod -e -json -compiled=true -test=true -export=false -deps=true -find=false -- builtin mod.com/...\n"}


[Trace - 09:21:59.863 AM] Received notification 'window/logMessage'.
Params: {"type":3,"message":"2021/03/05 09:21:59 go/packages.Load\n\tsnapshot=0\n\tdirectory=/artefacts/govim/cmd/govim/scenario_default/script-codelens_gc_details\n\tquery=[builtin mod.com/...]\n\tpackages=2\n"}


[Trace - 09:21:59.863 AM] Received notification '$/progress'.
Params: {"token":"5577006791947779410","value":{"kind":"end","message":"Finished loading packages."}}


[Trace - 09:21:59.863 AM] Received notification 'window/logMessage'.
Params: {"type":3,"message":"2021/03/05 09:21:59 go/packages.Load\n\tsnapshot=0\n\tpackage=\"builtin\"\n\tfiles=[/go/src/builtin/builtin.go]\n"}


[Trace - 09:21:59.863 AM] Received notification 'window/logMessage'.
Params: {"type":3,"message":"2021/03/05 09:21:59 go/packages.Load\n\tsnapshot=0\n\tpackage=\"mod.com\"\n\tfiles=[/artefacts/govim/cmd/govim/scenario_default/script-codelens_gc_details/main.go]\n"}


[Trace - 09:21:59.863 AM] Received request 'client/registerCapability - (3)'.
Params: {"registrations":[{"id":"workspace/didChangeWatchedFiles-0","method":"workspace/didChangeWatchedFiles","registerOptions":{"watchers":[{"globPattern":"**/*.{go,mod,sum}","kind":7}]}}]}


[Trace - 09:21:59.864 AM] Sending response 'client/registerCapability - (3)' in 0ms.
Result:


[Trace - 09:21:59.864 AM] Received request 'client/registerCapability - (4)'.
Params: {"registrations":[{"id":"workspace/didChangeConfiguration","method":"workspace/didChangeConfiguration"},{"id":"workspace/didChangeWorkspaceFolders","method":"workspace/didChangeWorkspaceFolders"}]}


[Trace - 09:21:59.864 AM] Sending response 'client/registerCapability - (4)' in 0ms.
Result:


[Trace - 09:21:59.864 AM] Received response 'textDocument/codeLens - (2)' in 126ms.
Result: [{"range":{"start":{"line":0,"character":0},"end":{"line":0,"character":0}},"command":{"title":"Toggle gc annotation details","command":"gopls.gc_details","arguments":["file:///artefacts/govim/cmd/govim/scenario_default/script-codelens_gc_details/main.go"]}}]


[Trace - 09:21:59.865 AM] Sending request 'workspace/executeCommand - (3)'.
Params: {"command":"gopls.gc_details","arguments":["file:///artefacts/govim/cmd/govim/scenario_default/script-codelens_gc_details/main.go"]}


[Trace - 09:21:59.865 AM] Received request 'window/workDoneProgress/create - (5)'.
Params: {"token":"8674665223082153551"}


[Trace - 09:21:59.865 AM] Sending response 'window/workDoneProgress/create - (5)' in 0ms.
Result:


[Trace - 09:21:59.865 AM] Received notification '$/progress'.
Params: {"token":"8674665223082153551","value":{"kind":"begin","title":"Toggling GC Details","cancellable":true,"message":"Running..."}}


[Trace - 09:22:00.318 AM] Received notification 'textDocument/publishDiagnostics'.
Params: {"uri":"file:///artefacts/govim/cmd/govim/scenario_default/script-codelens_gc_details/main.go","version":1,"diagnostics":[{"range":{"start":{"line":2,"character":5},"end":{"line":2,"character":5}},"severity":3,"source":"optimizer details","message":"canInlineFunction(cost: 2)"},{"range":{"start":{"line":6,"character":5},"end":{"line":6,"character":5}},"severity":3,"source":"optimizer details","message":"canInlineFunction(cost: 0)"}]}


[Trace - 09:22:00.318 AM] Received notification '$/progress'.
Params: {"token":"8674665223082153551","value":{"kind":"end","message":"completed"}}


[Trace - 09:22:00.318 AM] Received response 'workspace/executeCommand - (3)' in 453ms.
Result: null


[Trace - 09:22:00.380 AM] Sending request 'textDocument/codeLens - (4)'.
Params: {"textDocument":{"uri":"file:///artefacts/govim/cmd/govim/scenario_default/script-codelens_gc_details/main.go"}}


[Trace - 09:22:00.381 AM] Received response 'textDocument/codeLens - (4)' in 0ms.
Result: [{"range":{"start":{"line":0,"character":0},"end":{"line":0,"character":0}},"command":{"title":"Toggle gc annotation details","command":"gopls.gc_details","arguments":["file:///artefacts/govim/cmd/govim/scenario_default/script-codelens_gc_details/main.go"]}}]


[Trace - 09:22:00.381 AM] Sending request 'workspace/executeCommand - (5)'.
Params: {"command":"gopls.gc_details","arguments":["file:///artefacts/govim/cmd/govim/scenario_default/script-codelens_gc_details/main.go"]}


[Trace - 09:22:00.381 AM] Received request 'window/workDoneProgress/create - (6)'.
Params: {"token":"6129484611666145821"}


[Trace - 09:22:00.382 AM] Sending response 'window/workDoneProgress/create - (6)' in 0ms.
Result:


[Trace - 09:22:00.382 AM] Received notification '$/progress'.
Params: {"token":"6129484611666145821","value":{"kind":"begin","title":"Toggling GC Details","cancellable":true,"message":"Running..."}}


[Trace - 09:22:00.632 AM] Received notification 'textDocument/publishDiagnostics'.
Params: {"uri":"file:///artefacts/govim/cmd/govim/scenario_default/script-codelens_gc_details/main.go","version":1,"diagnostics":[]}


[Trace - 09:22:00.633 AM] Received notification '$/progress'.
Params: {"token":"6129484611666145821","value":{"kind":"end","message":"completed"}}


[Trace - 09:22:00.633 AM] Received response 'workspace/executeCommand - (5)' in 251ms.
Result: null


[Trace - 09:22:30.667 AM] Sending request 'shutdown - (6)'.
Params:


[Trace - 09:22:30.668 AM] Received response 'shutdown - (6)' in 0ms.
Result: null


[Trace - 09:22:30.668 AM] Received notification 'window/logMessage'.
Params: {"type":3,"message":"2021/03/05 09:22:30 Shutdown session\n\tshutdown_session=1\n"}