Zoom works only vertically in Premiere 23.6.0

Hi there,

After upgrading to 23.6.0 my timeline zoom would only work vertically instead of horizontally with my Sequence "Zoom in" and "Zoom Out" shotcuts (I have imported from previous versions).
I does work horizontally when selecting the Zoom tool and clicking in the timeline region, but it's a bit annoying and not ideal.
Any way to avoid this?
Thanks in advance.