increase the max character limit for the index keys in mariaDB

Question

On Nextcloud/social we have this problem:

 Primary index name on "oc_social_a2_cache_documts" is too long.

see: https://github.com/nextcloud/social/issues/850

Is there a way to increase the limit for the character length of the index?

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Update: The table structure is

REATE TABLE `oc_social_a2_cache_documts` (
  `id_prim` varchar(128) COLLATE utf8_bin NOT NULL,
  `id` varchar(1000) COLLATE utf8_bin DEFAULT NULL
  PRIMARY KEY (`id_prim`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

It works, If I rename the table to a shorter name with one character less: just oc_social_a2_cache_docums

But that is not a solution here, since it seems to have worked before in older versions I am not sure, how the problem could only occur now with the latest update???