Ctrl+] fails to jump to function definition after using Ctrl-T in .c file

[YSW0630]

Description:
When I use Ctrl+] in a *.c file to jump to a function's definition, it works correctly the first time. However, if I use Ctrl-T, :bdelete to jump back to the original *.c file and then use Ctrl+] again on the same function call, it reports "Couldn't get the TranslationUnit". However, there's no such problem in a C++ file

Steps to Reproduce:

1. Open a *.c file.
2. Place the cursor on a function call.
3. Press Ctrl+]. (This should successfully jump to the function definition.)
4. Press Ctrl-T to return to the original *.c file.
5. Press Ctrl+] again on the same function call. (This should fail with the error message.)

Expected Behavior:
Ctrl+] should consistently jump to the function definition, regardless of whether Ctrl-T was used in between.

[YSW0630]

I Just figured that remove the

autocmd filetype c let g:clang_user_options='-std=c11'
autocmd filetype cpp let g:clang_user_options='-std=c++20'

can fix the issue.