When we encounter a donor with more than 2 entries in the deduper interface query, all sharing the same email, we can only merge one set of data. When we try to merge the other sets of data for the same donor the entire query becomes unresponsive.
For visual reference, please see the screenshots of the CIDs I created for this testing.

1. What the query looks like:

2. Typical merging process

3. In this scenario, the first set of CIDs/data is gone since it was successfully merged, however, attempting the same procedure for the second set causes the entire query interface to become unresponsive, appearing grayed out.

This is delaying our deduping tremendously, causing a notable increase in donor complaints, as we're falling behind schedule, can we please have it fixed with the addition of any updates regarding this task https://phabricator.wikimedia.org/T353971? Let me know if there’s anything I can do to help, thank you!