SliderBug1165.java

import net.minecraft.block.Blocks;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.screen.Screen;
import net.minecraft.util.text.StringTextComponent;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.event.entity.player.PlayerInteractEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.client.gui.widget.Slider;
import net.minecraftforge.fml.common.Mod;

@Mod("sliderbug")
public class SliderBug1165 {

    public SliderBug1165() {
    }

    @Mod.EventBusSubscriber(bus = Mod.EventBusSubscriber.Bus.FORGE, modid = "sliderbug", value = Dist.CLIENT)
    public static class Client {
        @SubscribeEvent
        public static void onBlockRightClick(PlayerInteractEvent.RightClickBlock event) {
            class TestScreen extends Screen {
                protected TestScreen() {
                    super(StringTextComponent.EMPTY);
                }

                @Override
                protected void init() {
                    addButton(new Slider(this.width / 2 - 100,
                                                   this.height / 2 - 30,
                                                   200,
                                                   20,
                                                   new StringTextComponent("Slider 1: "),
                                                   StringTextComponent.EMPTY,
                                                   0D,
                                                   200D,
                                                   100D,
                                                   false,
                                                   true,
                                                   (b) -> {}));
                    addButton(new Slider(this.width / 2 - 100,
                                                   this.height / 2 + 10,
                                                   200,
                                                   20,
                                                   new StringTextComponent("Slider 2: "),
                                                   StringTextComponent.EMPTY,
                                                   0D,
                                                   200D,
                                                   100D,
                                                   false,
                                                   true,
                                                   (b) -> {}));
                }
            }
            if (event.getWorld().getBlockState(event.getPos()).is(Blocks.DIAMOND_BLOCK))
                Minecraft.getInstance().setScreen(new TestScreen());
        }
    }
}

SliderBug1181.java

import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.screens.Screen;
import net.minecraft.network.chat.TextComponent;
import net.minecraft.world.level.block.Blocks;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.client.gui.widget.Slider;
import net.minecraftforge.event.entity.player.PlayerInteractEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;

@Mod("sliderbug")
public class SliderBug1181 {

    public SliderBug1181() {
    }

    @Mod.EventBusSubscriber(bus = Mod.EventBusSubscriber.Bus.FORGE, modid = "sliderbug", value = Dist.CLIENT)
    public static class Client {
        @SubscribeEvent
        public static void onBlockRightClick(PlayerInteractEvent.RightClickBlock event) {
            if (!event.getWorld().isClientSide) return;
            class TestScreen extends Screen {
                protected TestScreen() {
                    super(TextComponent.EMPTY);
                }

                @Override
                protected void init() {
                    addRenderableWidget(new Slider(this.width / 2 - 100,
                                                   this.height / 2 - 30,
                                                   200,
                                                   20,
                                                   new TextComponent("Slider 1: "),
                                                   TextComponent.EMPTY,
                                                   0D,
                                                   200D,
                                                   100D,
                                                   false,
                                                   true,
                                                   (b) -> {}));
                    addRenderableWidget(new Slider(this.width / 2 - 100,
                                                   this.height / 2 + 10,
                                                   200,
                                                   20,
                                                   new TextComponent("Slider 2: "),
                                                   TextComponent.EMPTY,
                                                   0D,
                                                   200D,
                                                   100D,
                                                   false,
                                                   true,
                                                   (b) -> {}));
                }
            }
            if (event.getWorld().getBlockState(event.getPos()).is(Blocks.DIAMOND_BLOCK))
                Minecraft.getInstance().setScreen(new TestScreen());
        }
    }
}