We are also seeing issues when using php8.1:
Deprecated: Return type of WPCF7_FormTag::offsetExists($offset) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/html/dev.adst.org/wp-content/plugins/contact-form-7/includes/form-tag.php on line 542
Deprecated: Return type of WPCF7_FormTag::offsetGet($offset) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/html/dev.adst.org/wp-content/plugins/contact-form-7/includes/form-tag.php on line 528
Deprecated: Return type of WPCF7_FormTag::offsetSet($offset, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/html/dev.adst.org/wp-content/plugins/contact-form-7/includes/form-tag.php on line 516
Deprecated: Return type of WPCF7_FormTag::offsetUnset($offset) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/html/dev.adst.org/wp-content/plugins/contact-form-7/includes/form-tag.php on line 552
Deprecated: Return type of WPCF7_Validation::offsetExists($offset) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/html/dev.adst.org/wp-content/plugins/contact-form-7/includes/validation.php on line 129
Deprecated: Return type of WPCF7_Validation::offsetGet($offset) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/html/dev.adst.org/wp-content/plugins/contact-form-7/includes/validation.php on line 117
Deprecated: Return type of WPCF7_Validation::offsetSet($offset, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/html/dev.adst.org/wp-content/plugins/contact-form-7/includes/validation.php on line 98
Deprecated: Return type of WPCF7_Validation::offsetUnset($offset) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/html/dev.adst.org/wp-content/plugins/contact-form-7/includes/validation.php on line 139