Tesco Clubcard reward - corrupted QR code on email

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At the end of May I cashed out all my remaining clubcard vouchers for Prezzo vouchers, in 5 different batches. I've got 5 emails with the rewards, but on 2 of the emails the QR codes aren't showing. There's a tiny image in the box where the code should be. There's also a code next to each square, a jumble of random letters, does this represent the same thing? Do I need to contact Tesco or will the restaurant accept these letters as being valid?
Make £2024 in 2024
Prolific to 29/2/24 £184.97, Chase Interest £11.88, Chase roundup interest £0.18, Chase CB £16.96, Roadkill £1.10, Octopus referral reward £50, Octopoints £6.30 to 31/1/24, Topcashback £4.64, Shopmium £3
Total £279.03/£2024  13.8%

Make £2023 in 2023
Water sewerage refund: £170.62,Topcashback: £243.47, Prolific: to 31/12/23 £975, Haggling: £45, Wombling(Roadkill): £6.04,  Chase CB £149.34, Chase roundup interest £1.35, WeBuyBooks:£8.37, Misc sales: £406.59, Delay repay £22, Amazon refund £3.41, EDF Smart Meter incentive £100, Santander Edge Cashback-Fees: £25.14, Octopus Reward £50, Bank transfer incentives £400
Total: £2606.33/£2023  128.8%

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