[Resolved] When language is changed with the currency, then the other currency is rounded

I've been trying to use some WooCommerce and WPML hooks to make this conversion and rounding work, but I haven't succeeded.

I'm now working on a different custom shortcode approach and will share it with you as soon as it is ready.

Thank you for waiting, as I completed some testing.

I was able to achieve your desired automatic price conversion on my test website, by following these steps:

1. From WP Admin -> WooCommerce -> Settings -> General -> Number of decimals, I set the '6' decimal places for the default/primary currency (Euro).

2. And from WP Admin -> WooCommerce -> WooCommerce Multilingual & Multicurrency -> Multicurrency, I settled '1 EUR = 1.955877 BGN' with decimal places also set to '6'.

As a result and as per your observation, the automatic price conversion started to work, as needed.

3. For the challenge of not showing the long price values on the front end with '6' decimal places, I used the 'formatted_woocommerce_price' filter, from WooCommerce:

add_filter( 'formatted_woocommerce_price', 'custom_woo_decimal_price', 9999, 5 );
function custom_woo_decimal_price( $formatted_price, $price, $decimal_places, $decimal_separator, $thousand_separator ) {
	return substr($formatted_price,0,-3);
}

Note: You can include the above code snippet in your active child theme's 'functions.php' file.

This way for calculations, the full price with 6 decimal places will be used, but for display, the price with only 3 decimal places will be used.