I am planning to upgrade store from Magento 2.3.3 to 2.3.4
Are there any possible issues after upgrade?
Please let me know
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If you are using Elasticsearch as search engine, search will not work. see Github issue here
I think but i am not sure, Not a problem in 2.3.4 magento version and some problem after release magento 2.3.4 solved the by Magento Adobe And more for information please refer link :-
I suggest you upgrade the magento version.