As of Spring '19 release, it appears that our web tabs are now opening in a new window instead of within the Salesforce window in Lightning. Classic doesn't appear to be affected. Have others ran into this issue? We don't want the link to open in a new window.
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After opening a case with Salesforce, it was discovered this is a known issue with Spring 19. You can view the details in this link and click on the "This Issue Affects Me" to receive updates:
https://success.salesforce.com/issues_view?id=a1p3A000000BMy9QAG
