Perhaps you need to do this:
first, do this to find out what your local markdown version is:
curl -s --header "PRIVATE-TOKEN: your-api-token" https://gitlab.example.com/api/v4/application/settings | jq .local_markdown_version
install jq on your system if you don’t have this, since it will help filter out the other hundreds of settings so we can concentrate on the item we are after. On my system it reports zero because I haven’t needed to increase this value yet. The reason I ask you to check it’s current value is so that to invalidate the cache we want to increment the number. So, to increment:
curl -s --request PUT --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/application/settings?local_markdown_version=<increased_number>"
replace <increased_number> so for me it would be:
curl --request PUT --header "PRIVATE-TOKEN: your-api-token" "https://gitlab.example.com/api/v4/application/settings?local_markdown_version=1"
since my value is 0 (zero), then I will increment to 1 (one). So you will do similar by incrementing your existing number by 1 (one)