How to reproduce:

default server, default settings

1) Install the latest Zabbix server (tested with Revision bed5ab9 and with the latest Docker trunk image)

2) Add a Test media webhook for version 8.0 (Alerts>Media types):

zbx_webhook_test_80.yaml

3) Enable problem reporting for trigger actions (Alerts > Actions > Trigger actions).

4) Set up media notifications for the user (User settings>Notifications>Media>>Add) using the added Test webhook. The "Send to" field can be filled with any characters.

5) Create any host with an item, assign it a value (e.g., 0).

6) Set a trigger for this item to generate a problem (e.g., when item value = 1).

7) Trigger the problem by changing the item value to the alarming value (e.g., 1).

8) Go to Monitoring > Problems. The created problem should receive additional tags:
__tag1: value1, __tag2: value2, but it does not receive them correctly:

Expected behavior:

The triggered problem should receive the correct tags assigned by the webhook.

Notes:

• Issue does not appear in Zabbix versions: 7.0 (Revision 5891b60) and 7.4 (Revision bed5ab9)
• Issue was confirmed on two local machines and on a VM
• Also attaching webhooks for the remaining Zabbix versions.