Here’s the link to the latest weekly build of darktable 5.5, https://www.dropbox.com/scl/fi/t2s1lak5209nw3012m411/darktable-5.5.0-1523.g2c0526a89f-win64.exe?rlkey=mddkclf017sin4wxl5uawf6c7&st=k9rv5dil&dl=0. The list of latest changes is at Comparing 9821a00cbe…2c0526a89f darktable-org/darktable · GitHub
I have previously reported problems with the weekly and nightly builds where the space and backspace shortcuts didn’t work for me. I am pleased to say this is not an issue with this weeks build. 
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