Spoiling of xterm settings

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Hello,
built CPM32 (for Linux) yesterday and I've found two issues:
— after I leave emulator with Control-D, it always spoils terminal window settings (i.a. no echo, I have to type on the blind), which I have to restore with „stty sane” (edit: it must be anyway some bug in „rccp.com”, since when I leave the emulator by typing „exit”, there's no such problem)
— several BASIC interpreters refuse to cooperate with CPM32, reporting „unsupported calls”; for example an attempt to run MBASIC causes „ERROR: Unsupported BIOS call: 41b7(N-16219)” and crash (I get out of CPM32); surprisingly, trying BBCBASIC I get „Unsupported BDOS call: 45” and then… BASIC seems to be working normally. Why exactly various BASICs behave like that — when e.g. FORTH compilers seem to work OK — no idea.
Slackware64-15.0, kernel 6.1.28.