Uncaught TypeError: stripslashes()

I am running AIO 3.3.2 on two instances.
When I imported field groups, posts and settings pages it appears to work correctly.
However, now when I make changes to the custom fields on the site where I imported the data, I get a modal that says:

<p>There has been a critical error on this website. </p> <p> <a
href="https://wordpress.org/documentation/article/faq-
troubleshooting/">Learn more about troubleshooting WordPress. </
a></p>

When I review the debug log, I receive this error:
`
[18-Nov-2025 15:46:47 UTC] PHP Fatal error: Uncaught TypeError: stripslashes(): Argument #1 ($string) must be of type string, array given in /var/www/public_html/wp-content/plugins/meta-box-aio/vendor/wpmetabox/mbb-parser/src/Parsers/Base.php:195
Stack trace:
#0 /var/www/public_html/wp-content/plugins/meta-box-aio/vendor/wpmetabox/mbb-parser/src/Parsers/Base.php(195): stripslashes(Array)
#1 /var/www/public_html/wp-content/plugins/meta-box-aio/vendor/wpmetabox/mbb-parser/src/Parsers/Base.php(120): MBBParser\Parsers\Base->parse_json_dot_notations(Array)
#2 /var/www/public_html/wp-content/plugins/meta-box-aio/vendor/wpmetabox/mbb-parser/src/Parsers/Field.php(78): MBBParser\Parsers\Base->parse_array_attributes('options')
#3 /var/www/public_html/wp-content/plugins/meta-box-aio/vendor/wpmetabox/mbb-parser/src/Parsers/MetaBox.php(69): MBBParser\Parsers\Field->parse()
#4 [internal function]: MBBParser\Parsers\MetaBox->parse_field(Array, 1)
#5 /var/www/public_html/wp-content/plugins/meta-box-aio/vendor/wpmetabox/mbb-parser/src/Parsers/MetaBox.php(63): array_walk(Array, Array)
#6 /var/www/public_html/wp-content/plugins/meta-box-aio/vendor/wpmetabox/mbb-parser/src/Parsers/MetaBox.php(79): MBBParser\Parsers\MetaBox->parse_fields(Array)
#7 [internal function]: MBBParser\Parsers\MetaBox->parse_field(Array, 0)
#8 /var/www/public_html/wp-content/plugins/meta-box-aio/vendor/wpmetabox/mbb-parser/src/Parsers/MetaBox.php(63): array_walk(Array, Array)
#9 /var/www/public_html/wp-content/plugins/meta-box-aio/vendor/wpmetabox/mbb-parser/src/Parsers/MetaBox.php(23): MBBParser\Parsers\MetaBox->parse_fields(Array)
#10 /var/www/public_html/wp-content/plugins/meta-box-aio/vendor/meta-box/meta-box-builder/src/RestApi/Save.php(99): MBBParser\Parsers\MetaBox->parse()
#11 /var/www/public_html/wp-includes/rest-api/class-wp-rest-server.php(1292): MBB\RestApi\Save->save(Object(WP_REST_Request))
#12 /var/www/public_html/wp-includes/rest-api/class-wp-rest-server.php(1125): WP_REST_Server->respond_to_request(Object(WP_REST_Request), '/mbb/save', Array, NULL)
#13 /var/www/public_html/wp-includes/rest-api/class-wp-rest-server.php(439): WP_REST_Server->dispatch(Object(WP_REST_Request))
#14 /var/www/public_html/wp-includes/rest-api.php(459): WP_REST_Server->serve_request('/mbb/save')
#15 /var/www/public_html/wp-includes/class-wp-hook.php(324): rest_api_loaded(Object(WP))
#16 /var/www/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array)
#17 /var/www/public_html/wp-includes/plugin.php(565): WP_Hook->do_action(Array)
#18 /var/www/public_html/wp-includes/class-wp.php(418): do_action_ref_array('parse_request', Array)
#19 /var/www/public_html/wp-includes/class-wp.php(818): WP->parse_request('')
#20 /var/www/public_html/wp-includes/functions.php(1342): WP->main('')
#21 /var/www/public_html/wp-blog-header.php(16): wp()
#22 /var/www/public_html/index.php(17): require('/var/www/c6fe5d...')
#23 {main}
thrown in /var/www/public_html/wp-content/plugins/meta-box-aio/vendor/wpmetabox/mbb-parser/src/Parsers/Base.php on line 195
`

Note that I can make the same changes on the original instance and it works fine.