The glibc dynamic linker currently prevents moving a symbol from one soname to another if the symbol is versioned.  This is an artifact of the way symbol-specific versioning is implemented in glibc.  There is no fundamental technical reason to disallow this, and glibc 2.30 upstream lifts this restriction.

Upstream commit:

commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c
Author: Florian Weimer <fweimer>
Date:   Fri Jun 28 10:12:50 2019 +0200

    ld.so: Support moving versioned symbols between sonames [BZ #24741]
    
    This change should be fully backwards-compatible because the old
    code aborted the load if a soname mismatch was encountered
    (instead of searching further for a matching symbol).  This means
    that no different symbols are found.
    
    The soname check was explicitly disabled for the skip_map != NULL
    case.  However, this only happens with dl(v)sym and RTLD_NEXT,
    and those lookups do not come with a verneed entry that could be used
    for the check.
    
    The error check was already explicitly disabled for the skip_map !=
    NULL case, that is, when dl(v)sym was called with RTLD_NEXT.  But
    _dl_vsym always sets filename in the struct r_found_version argument
    to NULL, so the check was not active anyway.  This means that
    symbol lookup results for the skip_map != NULL case do not change,
    either.