TypeError and warning on preprocess_paragraph__oe_banner.

[alaeak1]

Log:
1 - TypeError: str_replace(): Argument #3 ($subject) must be of type array|string, Drupal\Core\Field\Plugin\Field\FieldType\StringItem given in str_replace() (line 1544 of /themes/contrib/oe_theme/oe_theme.theme).

2 - Warning: Attempt to read property "value" on string in /themes/contrib/oe_theme/oe_theme.theme on line 1545

How to reproduce:
Add this paragraph in any node, and try to render the node and you will get the type error.

Temporal fix to not get blocked:
Before:

  $variant = $paragraph->get('oe_paragraphs_variant')->first();
  if ($variant) {
    $variables['variant'] = str_replace('oe_banner_', '', $variant)->value;
  }

After:

  $variant = $paragraph->get('oe_paragraphs_variant')->first();
  if ($variant) {
    $variables['variant'] = str_replace('oe_banner_', '', $variant->getString());
  }