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It is allowed to set hyphens in groups of 2 digits or ommit them, so there are max 15 hyphens in the uuid.
But it is also allowed to set them in a row - and it does not make much sense and is not very clear when 15 of them are accepted, while 16 is not - it is confusing.
create table t1 (a uuid);
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MariaDB [test]> INSERT INTO t1 VALUES ('5796dac11a1c11--------------ecab4ef859-713e4be4');
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Query OK, 1 row affected (0.026 sec)
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MariaDB [test]> INSERT INTO t1 VALUES ('5796dac11a1c11---------------ecab4ef859-713e4be4');
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ERROR 1292 (22007): Incorrect uuid value: '5796dac11a1c11---------------ecab4ef859-713e4be4' for column `test`.`t1`.`a` at row 1
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