Weird behaviour with nested tables and log

[mjaanes]

Here is another (simpler) example that is not working. 
The code below does not print the "AAAAAAAAAAAAAAA" (the first line statement). 
If I comment out the log statement in the inner for-loop, everything works fine.

CODE:
-----------------------------------------------------------------
log('AAAAAAAAAAAAAAAAAA')

local pid = os.getpid()
spid = ' (pid=' .. pid .. ')'
log('STARTING SCRIPT ' .. _SCRIPTNAME .. spid)
 
log('BBBBBBBBBBBBBBBBBBB')

for i=1,2,1 do
log( 'CCCCCCCCCCCCCCCCCC')
  for j=1,3,1 do
    log('DDDDDDDDDDDDDDDD')
  end
end



OUTPUT:
-----------------------------------------------------------------
ZZTest 30.12.2019 12:04:03
* string: STARTING SCRIPT ZZTest (pid=5393)

---

ZZTest 30.12.2019 12:04:03
* string: BBBBBBBBBBBBBBBBBBB

---

ZZTest 30.12.2019 12:04:03
* string: CCCCCCCCCCCCCCCCCC

---

ZZTest 30.12.2019 12:04:03
* string: DDDDDDDDDDDDDDDD

---

ZZTest 30.12.2019 12:04:03
* string: DDDDDDDDDDDDDDDD

---

ZZTest 30.12.2019 12:04:03
* string: DDDDDDDDDDDDDDDD

---

ZZTest 30.12.2019 12:04:03
* string: CCCCCCCCCCCCCCCCCC

---

ZZTest 30.12.2019 12:04:03
* string: DDDDDDDDDDDDDDDD

---

ZZTest 30.12.2019 12:04:03
* string: DDDDDDDDDDDDDDDD

---

ZZTest 30.12.2019 12:04:03
* string: DDDDDDDDDDDDDDDD