[Gelöst] product search is not working in coupon usage restrictions

Background of the issue:
I have created a coupon and want to limit it to a few products. When I disable WPML the search works fine. Please check and let me know how to fix it. Link to a page where the issue can be seen: versteckter Link

Symptoms:
I could only see 1-2 products when I searched for those products. I can't even search using the product ID.

Questions:
Why can I only see 1-2 products when searching for products to limit the coupon to?
Why can't I search using the product ID?
Why does the product search work fine when WPML is disabled?