dear @ABraun,
i have the same problem.
it appears when the master follows the slave.
in my case the master is 20190220 and the slave 20190208. If i invert the pair all works.
i use the latest version of SNAP and all my plugins are upgraded on Ubuntu 18.04.
also @maxdragonheart has a similar problem.
You can try using :
S1A_IW_SLC__1SDV_20190208T165655_20190208T165723_025841_02E013_F08C
S1A_IW_SLC__1SDV_20190220T165655_20190220T165723_026016_02E64D_7066
let me know.
Ciao.