I can confirm that EQ works for me on patch 49 with Wine Stable 4.0.2. Graphics run smoothly, I can log in and camp out without client crashing.
Downloaded Wine from here:
https://dl.winehq.org/wine-builds/macosx/download.html
If I had to guess why Wine Stable works and Wineskin doesn't, I'd bet Wineskin uses an older version of Wine which doesn't support whatever new stuff's in that DLL.