Cannot right click while shift is held down

[Ipquarx]

I've been having this issue for around a month now. Whenever I hold down the shift key (Left or right) I can't use the right mouse button. If I right click and then use shift it works fine.
I've not recently installed any software or gotten a new mouse or keyboard. Any reason why this might be happening? I've checked through my console.log and nothing of interest appears.

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[Thorfin25]

There may be an add-on that you installed at the time conflicting with a parent going through while holding down shift, however this doesn't seem likely. Does it do this on a fresh install of Blockland?