@akash.nu
100% sure. Until very recently I worked in the merchant acquiring business. It‘s part of the standard authorisation message. Obviously they get the full PAN of the virtual card but the last 4 digits is also passed on of the real card number (the only exception being transit operators who get the full card number). Nothing can be done with just the last 4 digits, so it’s not a security issue.
It’s really a convenience thing as most people aren’t going to remember all their virtual card numbers and it does also give the option for the merchant to print both last 4 digit card numbers on the receipt for card present transactions (which makes returns easier as you can use the physical card as well). Some terminals in North America actually do that, I haven’t seen it in the UK (although Square terminals might do it, as they do it in NA).