'git merge remote but the .gitmodules not affected

I'm trying to modify a few codes of a time-series database TDengine (https://github.com/taosdata/TDengine) and intend to contribute back. I forked it to my github account. Then I set it as a remote repo. I notice it recently changed its submodule to move a directory 'tests' as a stand-alone repository. I used git merge to make my code base with the latest upstream code. But I wonder the .gitmodules file is not affected.

My steps are following:

Fork it to my github account.
git remote add upstream https://github.com/taosdata/TDengine
git fetch --all
git merge upstream/develop

after that merge is finished, the file .gitmodules doesn't have the change in upstream. Does anyone have clue?



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