Specify. The above problem remained even after completely reinstalling Wappler. However, the problem may be larger.
Before a full reinstall, Wappler was very buggy. After adding a new element to the page and saving it, it could delete script connections from the bottom of the <body> and insert new connections at the very beginning of the <body>, but incorrectly, which caused the page to stop working. Very similar to this behavior:
After a complete reinstall, no new bugs have been noticed yet. The bug with incorrect Bootstrap4Navigation connection did not disappear.