markdown-link-check
                                
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                        Possible failure when fetching URLs with escape characters?
It appears as though markdown-link-check fails to resolve https://en.wikipedia.org/wiki/TLA%2B - it continually gets a 400 response.
An example in CI: https://github.com/tendermint/tendermint/runs/5456708726?check_suite_focus=true
This GitHub Action currently uses markdown-link-check v3.8.7. Not sure if this has perhaps been fixed since?
I believe the issue has not been fixed yet. I am experiencing the same issue on markdown-link-check v3.9.0, v3.9.2, v3.9.3, and v3.10.0. markdown-link-check gets a 400 from https://img.shields.io/badge/%20imports-isort-%231674b1?style=flat&labelColor=ef8336, but Chrome gets a 200. In my case I was able to simply remove %20 and %23 from the URL, and the isort badge still works. For others looking for a workaround, maybe try the replacementPatterns configuration option.