Pasting "Foo" into LXterminal in XFCE produces "0~Foo1~"

I use LXTerminal 0.20. with XFCE 4.12.2 on Linux Mint 18.2 (upgraded from 18.1). When I copy text in some desktop app and paste it into an LXTerminal session, I get 0~ and 1~ prepended and appended, respectively, to the text. So, Hello world becomes 0~Hello World1~ This doesn't happen with XFCE4's "native" terminal app (xfce4-terminal), so **not the same issue as in this question - and not resolved by the answer there**. It also doesn't happen if I copy the text to apps with GUI (i.e. the text itself, in the clipboard, is fine). Why is this happening and what can I do to avoid it?