Contradiction with Job 8:20
Job 8:12 implies fragility, while Job 8:20 speaks of God's support for the blameless.
Job 8:20: Behold, God will not cast away a perfect [man], neither will he help the evil doers: [help...: Heb. take the ungodly by the hand] [come: Heb. shall not be]
Contradiction with Psalm 1:3
Job 8:12 depicts impermanence, whereas Psalm 1:3 describes stability and fruitfulness.
Psalm 1:3: And he shall be like a tree planted by the rivers of water, that bringeth forth his fruit in his season; his leaf also shall not wither; and whatsoever he doeth shall prosper. [wither: Heb. fade]
Contradiction with Isaiah 40:8
Job 8:12 shows the withering of the paper reed, which contrasts the idea of enduring Word of God in Isaiah 40:8.
Isaiah 40:8: The grass withereth, the flower fadeth: but the word of our God shall stand for ever.
Contradiction with John 15:5
Job 8:12 mentions drying up, which contrasts being fruitful by abiding in Christ as noted in John 15:5.
John 15:5: I am the vine, ye [are] the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing. [without me: or, severed from me]