This is probably just OpenCode nonsense. After prompting in "plan mode", the models will frequently ask you if you want to implement that, then if you don't switch into "build mode", it will waste five minutes trying but failing to "build" with equally nonsense behavior.

Honestly OpenCode is such a disappointment. Like their bewildering choice to enable random formatters by default; you couldn't come up with a better plan to sabotage models and send them into "I need to figure out what my change is to commit" brainrot loops.