I verified the proper working behavior in version 188.8.131.52 as well. The Oracle dev team will take a look and see what changed.
This issue is being tracked with Bug 13851993.
We suspect the problem was introduced when ODT started using a newer version of DDEX. This was right after ODT version 184.108.40.206.1. DDEX is the Data Designer Extensibility (DDEX) SDK supplied by Microsoft to allow Visual Studio integration.