Assign issue drop down in JIRA throws "The JIRA server was contacted but has returned an error response. We are unsure of the result of this operation" when the project key is TRUE or FALSE

Summary

If you have a project having as key TRUE or FALSE, when clicking on the 'Assignee' drop down in JIRA Cloud, the following error in the is thrown:

The JIRA server was contacted but has returned an error response. We are unsure of the result of this operation

Steps to Reproduce

1. Create a project having project key either TRUE or FALSE
2. Open the create issue window (you can press 'c' or click on the create issue button)
   3. Start typing in the ‘assignee’ box

Expected Results

The drop-down with the suggested users (the ones matching the characters entered in the box) is displayed

Actual Results

The below error is displayed:

The JIRA server was contacted but has returned an error response. We are unsure of the result of this operation

Workaround

Rename the project any other way, e.g. TRU and FALS, solves the issue