DisablePortal
You will not be able to activate portals, but you can enter the dimensions using a command.
Forge 1.20.1:

Paper/bukkit 1.21:

There is no difference; the system is the same as before.
❓ Questions that may arise
- Will there be an update to this project on Forge?
Me: I don't know, it became very difficult for me to work on mods.
- Will there be transitions to older versions? 1.20, 1.19, and even lower?
Me: Yes, the main transitions will be 1.20 and 1.19, but I'm not sure about the versions below that.
- Until when will the plugin be supported?
Me: The plugin will continue to be supported for a long time to come. If I discontinue support or stop being a modder, I will definitely write about it on the page for all my mods.
⚙️ Project plans (by importance)
- Long-term plugin support
- Translate plugin others language
- There are no plans to translate into other languages yet.
- Backporting of older versions will occur after the final update of the plugin.
All Versions
+ Add Version- Port 26.3
- Porting 26.2
- Porting 26.1.1
- Added support for Folia core
- Added support for French (Canada) language
- Added support for Polish language
- Added notification about new version availability
- Fixed spelling errors in many translations
- Added German localization
- Added Belarusian localization
- added Ukraine localization
- backported version full 1.21 API
- Added RU localization
- Added change localization in config file
- Ported in 1.21.11
- Ported in 1.21.10
- Added message in the plugin (Not mod)
- Save system false/true portal
- Commands to disable End and Nether separately have been added.
- Fixed the portal activation system. (Previously could be lit using other items)
- Removed messages about being unable to activate the portal.
- Upload Mod