Drop Index from Index tab fails

Attempting to drop an index from the indexes tab fails with message: "GSI index #indexname# not found."

Steps to reproduce:

Using travel-sample, create the following index with query workbench:

CREATE INDEX `ts_airlines` ON `travel-sample`.`inventory`.`airline`(`iata`,`name`);
 
Then open the Index tab, select the index, and click drop. The following message is displayed:
GSI index ts_airlines not found.
 
Workaround: Issue the following in query workbench:
DROP INDEX ts_airlines on `travel-sample`.inventory.airline;