WebGL: INVALID_OPERATION: useProgram: attempt to use a deleted object

Please include the following in your bug report:

**Version of emscripten/emsdk:**
Please include the output `emcc -v` here
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.73 (cbdb74973483dba58d9a78bf7ef6c0543d1a055f)
clang version 20.0.0git (https:/github.com/llvm/llvm-project 1d810ece2b2c8fab77720493864257f0ea3336a9)
Target: wasm32-unknown-emscripten
Thread model: posix

**Failing command line in full:**
If this is compile or link-time failure please include the full failing command
along with its entire output.

**Full link command and output with `-v` appended:**
Even for runtime issues it helps a lot if you can include the full link command.
Adding `-v` to the link command will show all of the sub-commands run which
can help us diagnose your issue.

at runtime, in a specific timing scenario, the console shows this error:
```
  | blitOffscreenFramebuffer | @ | 206cdb5……e19ccd8ff25.js:9661
-- | -- | -- | --
  | _emscripten_webgl_do_commit_frame | @ | 206cdb5……19ccd8ff25.js:12731
  | $_do_call | @ | 9cb0897……5399.wasm:0x10853ba
  | $em_task_queue_execute | @ | 9cb0897……05399.wasm:0xbbc83e
  | $receive_notification | @ | 9cb0897……5399.wasm:0x18ff27d
  | $em_task_queue_execute | @ | 9cb0897……05399.wasm:0xbbc83e
  | $_emscripten_check_mailbox | @ | 9cb0897……5399.wasm:0x1a4aaf1
  | (anonymous) | @ | 206cdb5……0e19ccd8ff25.js:684
  | callUserCallback | @ | 206cdb5……e19ccd8ff25.js:9203
  | checkMailbox | @ | 206cdb5……e19ccd8ff25.js:9235
```

I have created a PR that avoids showing this harmless error

https://github.com/rickg-hcl/emscripten/compare/master...rickg-hcl-patch-1