I performed a migration from WYSIWYG Web Builder 18 to WYSIWYG Web Builder 19.. There are 2 problems:
1. Icons from the master page are displayed incorrectly on other pages (they are empty- empty fields) in preview or after publish.
2. When checking page errors (error reports), it is written that there are no BALTIC fonts. For example, Arial Baltic (because I use Lithuanian letters)
I have been using WYSIWYG Web Builder for several years and I have not encountered these problems.
Hope you can find a solution!

Project
https://www.solvat.lt/Med19.wbs