Although you should be able to put any item in a bundle, you can't put a debug stick in a bundle.
Steps to reproduce:
Get a bundle.
Get a debug stick, potion, boat, cocoa beans, or seeds.
Right click a bundle with the item in your inventory.
The item doesn't go into the bundle.
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Comments 3
Thank you for your report!
However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers like Hypixel, please contact them first as they run modified server software.
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Invalid, modded game.