Screenshot from tax settings:
https://ibb.co/K75Yq6d
I found that the problem is in the file variation-price-display\includes\conditions.php and especially on function vpd_format_price.
You have to add a second argument like here: $product->get_variation_price($type, true)
I have the same issue. Woocommerce settings on Tax:
Prices entered with tax -> No, I will enter prices exclusive of tax
Display prices in the shop -> Including tax
