This was caused by Bug 1563844. See here: https://treeherder.mozilla.org/#/jobs?repo=autoland&selectedJob=256443751&searchStr=junit5&tochange=4629e855ea33d85f8adcc6e76264ac779b799bd1&fromchange=2df4e34175d24a7865ea0a623a6353ba9afb9779 (note this bug landed on the 11th too but was backed out).
Bug 1565422 Comment 2 Edit History
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This was caused by Bug 1557096. See here: https://treeherder.mozilla.org/#/jobs?repo=autoland&selectedJob=256443751&searchStr=junit5&tochange=4629e855ea33d85f8adcc6e76264ac779b799bd1&fromchange=2df4e34175d24a7865ea0a623a6353ba9afb9779 (note this bug landed on the 11th too but was backed out).