It is related to this:
  /* Keep track of the lowest address a relevant sizeless symbol could have.  */
  GElf_Addr min_label = addr;
when there's no sized symbol containing addr preventing this:
  /* If we found no proper sized symbol to use, fall back to the best
     candidate sizeless symbol we found, if any.  */
  if (closest_name == NULL
      && sizeless_name != NULL && sizeless_sym.st_value >= min_label)
from applying.

my assembler looks like either:

# A global symbol that has zero size.
GLOBAL(global_st_size_0)
        LOAD_IMMED_BYTE (REG0, 0)
        STORE (REG0, REG0)  <--------- addr is here
        NO_OP
# A local symbol that has zero size.
LOCAL(local_st_size_0)
        LOAD_IMMED_BYTE (REG0, 0)
        STORE (REG0, REG0)  <--------- addr is here
        NO_OP

a simple example though is _start.