I have this is my settings. Almost identical but my server is using utf8mb4_unicode_ci vs. utf8mb4_unicode_520_ci in your sample above.

———————————
Settings:
———————————

Multisite: No

FV Player version: 7.4.17.727
FV Player core version: 7.2.7
FV Player license: Valid (next check 2020-05-05 18:59:07 GMT)

FV Player Pro version: 7.4.16.727
FV Player Pro license: Valid (next check 2020-05-05 18:59:06 GMT)

WordPress Version: 5.3.2
Permalink Structure: /%postname%/
Active Theme: Myriad 1.0 (BackStop Themes – my theme company)

Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
PHP Version: 5.6.40-0+deb8u11
MySQL Version: 5.5.62
Web Server Info: Apache

WordPress Memory Limit: 128M
PHP Memory Limit: 256M
PHP Upload Max Size: 50M
PHP Post Max Size: 50M
PHP Upload Max Filesize: 50M
PHP Time Limit: 60
PHP Max Input Vars: 1000
PHP Arg Separator: &
PHP Allow URL File Open: Yes
WP_DEBUG: Disabled

DISPLAY ERRORS: On (1)
cURL: Your server supports cURL.

———————————-

CREATE TABLE `wp_fv_player_playermeta` (
  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `id_player` bigint(20) unsigned NOT NULL DEFAULT '0',
  `meta_key` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,
  `meta_value` longtext COLLATE utf8mb4_unicode_ci NOT NULL,
  PRIMARY KEY (`id`),
  KEY `id_player` (`id_player`),
  KEY `meta_key` (`meta_key`(191))
) ENGINE=InnoDB AUTO_INCREMENT=24 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci

——————————————————–