ताण्ड्य महाब्राह्मण / पञ्चविंश ब्राह्मण (सायण भाष्य एवं चिन्नस्वामी शास्त्री टीका सहित)

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Wait, look closely at line 15: above यज्ञं, is that a candrabindu?
Wait, no, it's यज्ञं॑ or is it just a smudge?
Wait, look at line 17: ऋतुस्तस्मात्त्रिवृत्स्तोमानां - no accents anywhere!
Line 16: मसृजत तं गायत्रीच्छन्दो... - no accents!
Line 18: त्री च्छन्दसामग्निर्दैवतानां... - no accents!
Line 19: ऋतूनां तस्माद्ब्राह्मणो मुखेन... - no accents!
Line 20: सृष्टः ॥ ६ ॥ - no accents!
This entire book has NO Vedic svara accents!
Wait, but what is that mark above यज्ञं in line 15?
It looks like an anusvara with a slight printing defect or ink squash, or maybe यज्ञँ? But यज्ञं सृजेयेति is followed by सृ, so in Sāmaveda sometimes gum/anunāsika is marked, but here it's just a bindu with an ink mark, or maybe यज्ञं. Let's look at line 8: तत्राश्वतरीन्दद्याद्यजमान -> रीन्दद्याद्य.
Wait, let's look at यज्ञं in line 15 again. It's