Overview of the Issue
When translating posts using WPML’s Advanced Translation Editor (ATE) Gen3, URLs containing ampersand (&) characters have it removed in the translated version. For example, a URL like https://wpml.org/?parameter=variable&par ameter2=variable2 is incorrectly translated to https://wpml.org/?parameter=variableparameter2=variable2. The issue does not occur when using ATE Gen2.
You may also experience a similar situation with ampersands directly added in the content but stripped from translations.
Workaround
This issue is fixed. Updating to the latest version solves it on your site, so you only need this workaround if you can’t update yet.
Until this issue is resolved, switching to ATE Gen2 is a viable workaround.