SQL statements containing $ character are sucessfully passed through MariaDB

I have been figuring out mysqlbinlog restore issue for some days and I have found that it is caused by some uncomplete SQL statements which are containing $ character.

Following SQL statements are logged into the general log and also appear in the binary logs:

delete from build_type$
insert into build_type$ values ('bt3') 
delete from vcs_root_instance$

Why these statements passthrough (contatining $ symbol). Database is containing tables without $ symbol - build_type, vcs_root_instance?

desc build_type;
+-------------------+-------------+------+-----+---------+-------+
| Field             | Type        | Null | Key | Default | Extra |
+-------------------+-------------+------+-----+---------+-------+
| int_id            | varchar(80) | NO   | PRI | NULL    |       |
| config_id         | varchar(80) | NO   | UNI | NULL    |       |
| origin_project_id | varchar(80) | YES  |     | NULL    |       |
| delete_time       | bigint(20)  | YES  |     | NULL    |       |
+-------------------+-------------+------+-----+---------+-------+

MariaDB version: 10.2.23