https://streamable.com/0qmg9
In the video, the wandering villager cannot pathfind to the pressure plate if there is a block. (Not shown in the video, but if there is a block anywhere in the same column, not necessarily at the end).
However, when the block is broken, they can find their way.
How to Reproduce
Download
[media]and click the button.
Cannot reproduce in a similar scenario.
Please check if this is still an issue for you in 1.15.1 and if so, please attach a zipped world file with a reproducible setup. If the world file is too big to be attached to this report directly, please upload it elsewhere and link it here.