3 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Costly or dangerous
Door gasket spring detaches and machine leaks water during wash (WGK252Z0TR)
Owner complaint on Şikayetvar (query 'Bosch WGK252Z0TR sorun'): within the first month the spring inside the door gasket came out; after the gasket was replaced the machine began throwing clean (non-detergent) water out during wash on various programs. The owner reports the issue persisted unresolved for 9 months across multiple service visits, with service calling it normal.
What to check. Before buying, check the door seal fit and ask whether gasket/spring detachment is a known issue on this model; if it occurs in warranty, push for a documented repair or replacement rather than accepting a 'normal' verdict.
Machine tears, cuts and punctures laundry from first use (WGK252Z0TR)
Owner complaint on Şikayetvar (query 'Bosch WGK252Z0TR şikayet'): from the very first wash the machine tore, cut and punctured clothes even at 30°C and 400 rpm spin; the owner reports the dealer refused the return request.
What to check. If you buy this model, test the first few loads with a cheap or sacrificial load to check for fabric damage; a machine that damages clothes from day one is a strong case for return/replacement.
Home Connect app drops out after every wash (WGK252Z0TR)
Verified-buyer review on Hepsiburada (query 'Bosch WGK252Z0TR common problems'): the Home Connect app disables itself after every wash and must be re-enabled each cycle; the owner notes this is not the case on their Bosch dishwasher.
What to check. Treat the app as a minor convenience; if remote control matters to you, verify the app stays connected, otherwise this is a low-cost software annoyance, not a hardware failure.
These reports come from the pages linked under each item: owner forums, repair guides and workshops. They are not a diagnosis of any one unit, and a careful check of the one you are buying still applies.
Text from the Kriko Washing machines catalog, version 0.1.2, under the CC-BY-SA-4.0 license.