The Mod Menu GUIs are not openable via "open gui" action on button

Create a button that has the button action "open gui" and set it to the menu identifier of a mod in mod menu. The button will not open the gui.

• OS: Ubuntu 21.10 Linux
• FancyMenu Version 2.3.0
• Minecraft Version 1.16.5
• Active Mods:
  • advancedchat
  • advancednbttooltip
  • amecs
  • amecsapi
  • antiautojump
  • anycapes
  • architectury
  • armourtoughnessbar
  • artifice
  • audiooutput
  • aurora_keystrokes
  • auto_third_person
  • autoconfig1u
  • bclib
  • better-local-server
  • betterdroppeditems
  • betterf1
  • betterf3
  • bettermounthud
  • boatiview
  • boostedbrightness
  • borderlessmining
  • chat_heads
  • cherishedworlds
  • classicombat
  • cleardespawn
  • cloth-api
    • cloth-config
  • completeconfig
  • continuebutton
  • controlling
  • cotton-client-commands
  • cr-compass-ribbon
  • craftpresence
  • crowdin-translate
  • Custom Selection Box
  • cullleaves
  • cursormod
  • custom-crosshair-mod
  • customsplashscreen
  • damagetint
  • detailab
  • durability101
  • dynamicfps
  • dynamicsoundfilters
  • enhancedblockentities
  • entity-distance
  • fabric
  • fabric-api
  • fabricloader
  • fallingleaves
  • fancymenu
  • ferritecore
  • fiber
  • firstperson
  • fixmygg
  • flighthud
  • fpsreducer
  • gbfabrictools
  • healthoverlay
  • horsestatsvanilla
  • illuminations
  • inventoryhud
  • itemmodelfix
  • java16
  • kirin
  • konkrete
  • kronhud
  • krypton
  • lazydfu
  • libgui
  • loading-timer
  • lowfire
  • malilib
  • mambience
  • minecraft1.16.5
  • minemenufabric
  • modmenu
  • nmuk
  • nobreak
  • nomoreglowingpots
  • not-enough-servers
  • notenoughanimations
  • notenoughcrashes
  • now-playing
  • oauth-fabric
  • offlineskins
  • okzoomer
  • optifabric
  • particlerain
  • perspectivemod
  • petowner
  • phosphor
  • pin that
  • pling
  • polish
  • presencefootsteps
  • replaymod
  • resolutioncontrol
  • respackopts
  • screenshotclipboard
  • skyblocker
  • slight-gui-modifications
  • slimeblockredstone
  • smooth-chunks
  • smoothboot
  • sneaktweak
  • spark
  • spruceui
  • stevekungs_lib
  • swordblocking
  • timechanger
  • timetolive
  • toolscroll
  • tooltipfix
  • transliterationlib
  • voidfog
  • vanilla_tweaks_downloader
  • waterdripsound
  • windowthonk
  • worldedit
  • worldeditcui

I tested this in both 1.16 and 1.18 and it seems to work just fine.
What's the exact menu identifier you're trying to use to open the menu?

Closed because no response and not reproducable.