As the title says, the parser appears to get confused when it encounters terms from the list of 5e sizes, i.e., tiny, small, medium, large, huge or gargantuan in other parts of the stat block, typically in Actions, Bonus Actions and Reactions. The result is that the action in question isn't imported properly and the size, type and alignment is overwritten.
E.g., if an action contains the phrase "Large or smaller" to describe acceptable targets for the action, the size becomes "Large", the type becomes "Or" and the alignment becomes "Smaller".
It is relatively simple to work around by replacing any of these terms with some placeholder text and importing it, then manually adding the removed term(s) in the action/bonus action/reaction.
Here's an example from importing the Voiceless Talker from MCDM's Flee, Mortals!
The statblock as copy-pasted into the parser:
Voiceless Talker
Medium Aberration, Typically Lawful Evil
Armor Class 16 (natural armor)
Hit Points 91 (14d8 + 28)
Speed 30 ft., fly 30 ft.
STR DEX CON INT WIS CHA
10 (+0) 16 (+3) 14 (+2) 19 (+4) 15 (+2) 14 (+2)
Saving Throws Con +5, Int +7, Wis +5
Skills Arcana +7, Deception +5, Insight +5, Perception +5,
Persuasion +5, Stealth +6
Damage Resistances bludgeoning
Senses darkvision 120 ft., passive Perception 15
Languages Deep Speech, Undercommon, telepathy 120 ft.
Proficiency Bonus +3
ACTIONS
Multiattack. The voiceless talker manifests a power and makes
one Tentacle or Psionic Pistol attack.
Tentacle. Melee Weapon Attack: +7 to hit, reach 10 ft., one
target. Hit: 15 (2d10 + 4) psychic damage, and if the target is
Large or smaller, they are grappled (escape DC 15).
Psionic Pistol. Ranged Weapon Attack: +7 to hit, range
80/320 ft., one target. Hit: 15 (2d10 + 4) force damage.
*Memory Thief (4th-Order Power). The voiceless talker
psionically plunders the mind of a creature they can see
within 30 feet of them. The target must make a DC 15
Intelligence saving throw. On a failed save, the
target takes 22 (4d10) psychic damage, and
until they finish a long rest or die, their proficiency
bonus is cumulatively lowered by 1 and the voiceless
talker gains a cumulative +2 bonus to damage rolls.
On a successful save, a target takes half as much damage
and doesn’t have their proficiency bonus reduced.
A creature whose proficiency bonus drops to 0 can’t form
new thoughts or speak, and they have disadvantage on ability
checks, attack rolls, and saving throws.
Flay (3/Day; 5th-Order Power). The voiceless talker shoots
forth a 15-foot cone of pure psionic energy. Each creature in
the area must make a DC 15 Intelligence saving throw, taking
28 (8d6) psychic damage on a failed save, or half as much
damage on a successful one.
Guise (3rd-Order Power). The voiceless talker projects a
psionic image over their body, transforming their appearance
for 1 hour into that of a Medium creature they have seen.
When they manifest this power, they can also change the
appearance of any equipment they carry for the duration.
The changes wrought by this power fail to hold up to
physical inspection. A creature can use an action to inspect the
voiceless talker’s appearance and make a DC 15 Intelligence
(Investigation) check, noticing the image is a projection on
a success.
REACTIONS
Brain Drain. When a creature grappled by the voiceless
talker makes a saving throw against one of the voiceless talker’s
powers, the voiceless talker momentarily weakens the creature
and the creature has disadvantage on the saving throw.
CR 7
As the title says, the parser appears to get confused when it encounters terms from the list of 5e sizes, i.e., tiny, small, medium, large, huge or gargantuan in other parts of the stat block, typically in Actions, Bonus Actions and Reactions. The result is that the action in question isn't imported properly and the size, type and alignment is overwritten.
E.g., if an action contains the phrase "Large or smaller" to describe acceptable targets for the action, the size becomes "Large", the type becomes "Or" and the alignment becomes "Smaller".
It is relatively simple to work around by replacing any of these terms with some placeholder text and importing it, then manually adding the removed term(s) in the action/bonus action/reaction.
Here's an example from importing the Voiceless Talker from MCDM's Flee, Mortals!
The statblock as copy-pasted into the parser:
Results in the following stat block in Foundry: