Broken Watchlist Removal Functionality

I'm not sure when exactly this bug first cropped up, but I am on IOS 18.3 with IMDB app version 15.4.

I am experiencing issues when removing movies from my watchlist.  My typical procedure after I have watched a movie is, from a movie's page that is already on my watchlist, to click the "three dots" in the upper right hand corner and choose "Add to List".  I then click the plus icon next to the appropriate list to which I want to add the movie (which is always successful) and then I click the Watchlist list (in order to remove the movie from that list).  I am rewarded with a pop-up message that says "Item Removed From List".  That has worked fine for many years.  Recently, though, when I follow that procedure and click Done to go back to the main movie page, the page displays "Added to Watchlist" directly underneath the genre tags.  I can confirm that the movie is, in fact, still on my watchlist by navigating to My Lists, Watchlist, and then searching that list for the movie title.  It seems that the only way that actually works to remove a movie from a watchlist right now is to click on the watchlist checkmark, either on the main movie page or on a page or list that shows a thumbnail of the movie with the watchlist checkbox in the upper left hand corner of the thumbnail.