Cannot add 2 consecutive mentions

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.1.X, 7.2.X, 7.3.X, Master
• Fix Version/s: 7.0.0 DXP FP95, 7.0.10.15 DXP SP15, 7.0.X, 7.1.10 DXP FP20, 7.1.10.5 SP5, 7.1.X, 7.2.10 DXP FP9, 7.2.X, 7.3.5 CE GA6, 7.3.10 DXP GA1, Master
• Component/s: Mentions
• Labels:
  • ee-ts
  • liferay-dxp-70-sp15
  • liferay-dxp-71-sp5
  • liferay-fixpack-de-95-7010
  • liferay-fixpack-dxp-20-7110
  • liferay-fixpack-dxp-9-7210
• Branch Version/s:
  7.2.x, 7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Git Pull Request: https://github.com/liferay-frontend/liferay-portal/pull/223

Description
Cannot add 2 consecutive mentions.

Steps to reproduce

1. Add two public users (user1, user2)
2. Add a Message board portlet
3. Posting a new thread
4. Add a mention to @user1
5. Add a new mention to @user2 right after (after the blank space)

Actual result
Mention list is not displayed.
(See attached video)

Expected result
Mention list is displayed and can be added successfully.

Reproduced in
DE-93
70x Commit: 135d85fcd09f81128323f6a8c595a528f8d4d0a9
Master Commit: 47015c9f3e55d018ad77af289b0c5581c4c58f82

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