https://www.rferl.org/a/early-slavs-.../31110277.html

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"The person who wrote this inscription could have been a person of Germanic origin, but they would have lived among Slavs," he says, citing the fact that there are historical records from around this time of Germanic "emigrants" living among Slavic peoples, which lends credence to this idea. "But the other possibility is that it was written by Slavs who learned it from the Germanic peoples."
Possible "cultural appropriation" of the Elder Futhark by early Slavic-speakers in what is now the Czech Republic. Very interesting find.