The test file should have tags in the group, but unfortunately it does not.

tag-test.kdbx

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<KeePassFile>
  <Meta>
    <Generator>KdbxWeb</Generator>
    <SettingsChanged>2023-03-29T01:42:17Z</SettingsChanged>
    <DatabaseName>title</DatabaseName>
    <DatabaseNameChanged>2023-03-29T01:42:17Z</DatabaseNameChanged>
    <DatabaseDescription />
    <DatabaseDescriptionChanged>2023-03-29T01:42:17Z</DatabaseDescriptionChanged>
    <DefaultUserName />
    <DefaultUserNameChanged>2023-03-29T01:42:17Z</DefaultUserNameChanged>
    <MaintenanceHistoryDays>365</MaintenanceHistoryDays>
    <Color />
    <MasterKeyChanged />
    <MasterKeyChangeRec>-1</MasterKeyChangeRec>
    <MasterKeyChangeForce>-1</MasterKeyChangeForce>
    <RecycleBinEnabled>True</RecycleBinEnabled>
    <RecycleBinUUID>v9GCTOsnFHmroPKBXhJRVg==</RecycleBinUUID>
    <RecycleBinChanged>2023-03-29T01:42:17Z</RecycleBinChanged>
    <EntryTemplatesGroup>AAAAAAAAAAAAAAAAAAAAAA==</EntryTemplatesGroup>
    <EntryTemplatesGroupChanged>2023-03-29T01:42:17Z</EntryTemplatesGroupChanged>
    <HistoryMaxItems>10</HistoryMaxItems>
    <HistoryMaxSize>6291456</HistoryMaxSize>
    <LastSelectedGroup>BOIY32hONr+4tlcNPRMrVw==</LastSelectedGroup>
    <LastTopVisibleGroup>BOIY32hONr+4tlcNPRMrVw==</LastTopVisibleGroup>
    <MemoryProtection>
      <ProtectTitle>False</ProtectTitle>
      <ProtectUserName>False</ProtectUserName>
      <ProtectPassword>True</ProtectPassword>
      <ProtectURL>False</ProtectURL>
      <ProtectNotes>False</ProtectNotes>
    </MemoryProtection>
    <CustomIcons />
    <Binaries />
    <CustomData />
  </Meta>
  <Root>
    <Group>
      <UUID>BOIY32hONr+4tlcNPRMrVw==</UUID>
      <Name>title</Name>
      <Notes />
      <IconID>49</IconID>
      <Times>
        <CreationTime>2023-03-29T01:42:17Z</CreationTime>
        <LastModificationTime>2023-03-29T01:42:17Z</LastModificationTime>
        <LastAccessTime>2023-03-29T01:42:17Z</LastAccessTime>
        <ExpiryTime>2023-03-29T01:42:17Z</ExpiryTime>
        <Expires>False</Expires>
        <UsageCount>0</UsageCount>
        <LocationChanged>2023-03-29T01:42:17Z</LocationChanged>
      </Times>
      <IsExpanded>True</IsExpanded>
      <DefaultAutoTypeSequence />
      <EnableAutoType>null</EnableAutoType>
      <EnableSearching>null</EnableSearching>
      <LastTopVisibleEntry>AAAAAAAAAAAAAAAAAAAAAA==</LastTopVisibleEntry>
      <Group>
        <UUID>v9GCTOsnFHmroPKBXhJRVg==</UUID>
        <Name>Recycle Bin</Name>
        <Notes />
        <IconID>43</IconID>
        <Times>
          <CreationTime>2023-03-29T01:42:17Z</CreationTime>
          <LastModificationTime>2023-03-29T01:42:17Z</LastModificationTime>
          <LastAccessTime>2023-03-29T01:42:17Z</LastAccessTime>
          <ExpiryTime>2023-03-29T01:42:17Z</ExpiryTime>
          <Expires>False</Expires>
          <UsageCount>0</UsageCount>
          <LocationChanged>2023-03-29T01:42:17Z</LocationChanged>
        </Times>
        <IsExpanded>True</IsExpanded>
        <DefaultAutoTypeSequence />
        <EnableAutoType>False</EnableAutoType>
        <EnableSearching>False</EnableSearching>
        <LastTopVisibleEntry>AAAAAAAAAAAAAAAAAAAAAA==</LastTopVisibleEntry>
      </Group>
      <Group>
        <UUID>BZICrsHyyVbO5AP7/g9Xjg==</UUID>
        <Name>Tagged Group</Name>
        <Notes />
        <IconID>48</IconID>
        <Times>
          <CreationTime>2023-03-29T01:42:17Z</CreationTime>
          <LastModificationTime>2023-03-29T01:42:17Z</LastModificationTime>
          <LastAccessTime>2023-03-29T01:42:17Z</LastAccessTime>
          <ExpiryTime>2023-03-29T01:42:17Z</ExpiryTime>
          <Expires>False</Expires>
          <UsageCount>0</UsageCount>
          <LocationChanged>2023-03-29T01:42:17Z</LocationChanged>
        </Times>
        <IsExpanded>True</IsExpanded>
        <DefaultAutoTypeSequence />
        <EnableAutoType>null</EnableAutoType>
        <EnableSearching>null</EnableSearching>
        <LastTopVisibleEntry>AAAAAAAAAAAAAAAAAAAAAA==</LastTopVisibleEntry>
        <Entry>
          <UUID>eswZWk2Puq1cpIdc/IcW/Q==</UUID>
          <IconID>0</IconID>
          <ForegroundColor />
          <BackgroundColor />
          <OverrideURL />
          <Tags>tag1, tag2</Tags>
          <Times>
            <CreationTime>2023-03-29T01:42:17Z</CreationTime>
            <LastModificationTime>2023-03-29T01:42:17Z</LastModificationTime>
            <LastAccessTime>2023-03-29T01:42:17Z</LastAccessTime>
            <ExpiryTime>2023-03-29T01:42:17Z</ExpiryTime>
            <Expires>False</Expires>
            <UsageCount>0</UsageCount>
            <LocationChanged>2023-03-29T01:42:17Z</LocationChanged>
          </Times>
          <String>
            <Key>Title</Key>
            <Value />
          </String>
          <String>
            <Key>UserName</Key>
            <Value />
          </String>
          <String>
            <Key>Password</Key>
            <Value ProtectInMemory="True" />
          </String>
          <String>
            <Key>URL</Key>
            <Value />
          </String>
          <String>
            <Key>Notes</Key>
            <Value />
          </String>
          <AutoType>
            <Enabled>True</Enabled>
            <DataTransferObfuscation>0</DataTransferObfuscation>
          </AutoType>
          <History />
        </Entry>
      </Group>
    </Group>
    <DeletedObjects />
  </Root>
</KeePassFile>