If a resource pack’s selection.png for the gamemode switcher is opaque or translucent, the gamemode switcher icons will be invisible. This does not occur in 1.21.5. Attached is a comparison between 1.21.5 and 25w15a.
MC-296511
Gamemode Switcher icons become invisible when using resource pack with opaque or translucent selection.png
Resolved
Fixed
2
Community Consensus
Resource Packs, Textures and models
25w15a, 25w16a
25w17a
Retrieved
Can you attach a resource pack for easier reproduction?