Syntax highlighting of comment blocks occasionally fails

#### System information:
- Kubuntu 20.04
- DBeaver 21.1
- Additional extensions

#### Connection specification:
- Database name and version: PostgreSQL v12
- Driver name: PostgreSQL
- Do you use tunnels or proxies (SSH, SOCKS, etc)? No

#### Describe the problem you're observing:

I observed that recently (since several months ago) syntax highlighting of comment blocks fails, renders part of comment as a code. It also leads to render true code which follows mentioned comment as a comment. See in example below, BEGIN word is highlighted as a comment.

#### Steps to reproduce, if exist:

Here is example of code which is breaks syntax highlighting. It's the beginning of function code.

```
CREATE OR REPLACE FUNCTION sql_queues.push(_queue character varying, _query character varying)
RETURNS void
LANGUAGE plpgsql
AS $function$/*DOCU
Inserts data to SQL Queue

### IN params:
* `_queue` VARCHAR, queue name, Ussually table name without 'q_' prefix
* `_query` - SQL to be stored into queue. Can valid SQL script

### Changelog
| Date | Author | JIRA | Description |
| ---------- | ----------- | ----- | ---------------------------------------------------------- |
| 2021-06-16 | @bartakm | | added check for provided query since it's called everywhere |
| 2019-12-09 | @kozusznikm | | initial version |

### Is unified: YES
DOCU*/
BEGIN
```
and screenshot how it looks like:

You can see the syntax highliting breaks in several places
* around 'q_' prefix causing next line to be not treated as comment anymore
* wrong syntax highliting stops at work "it;s" but single quote character is somehow significant, because removing it makes wrong highlighting continue...

Anyway I failed in attempts to find exact scenario what combination of characters leads to the issue.